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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(3/x)-7 = 4/x-7 // - 4/x-7
x-(3/x)-(4/x)-7+7 = 0
x-3*x^-1-4*x^-1-7+7 = 0
1*x^1-7*x^-1 = 0
(1*x^2-7*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-7*x^0) = 0
x^1
x^2-7 = 0
x^2-7 = 0
DELTA = 0^2-(-7*1*4)
DELTA = 28
DELTA > 0
x = (28^(1/2)+0)/(1*2) or x = (0-28^(1/2))/(1*2)
x = 7^(1/2) or x = -7^(1/2)
x in { -7^(1/2), 7^(1/2)}
x in { -7^(1/2), 7^(1/2) }
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